Preventing roof leaks during installation
Roof tightness depends primarily on roof pitch, the quality of joints and the way water is drained, not on the sheet metal alone. Check the specified pitch against the installation instructions for the selected covering. T18, T35 and tile-effect sheets need not share the same limits. It is also worth tracing the entire water path from ridge to eaves, checking the choice of underlay and planning flashings at the chimney and service penetrations. The key decision concerns the compatibility of the covering with the roof geometry and fixing system, not the number of sealants.









